Senescence in detached oat leaves, 1: Changes in free amino acid levels

aba acide abscissique aging agricultural chemicals amino acids anatomia anatomie anatomy avenas avoine cereales cereals crops cultivos cultivos de grano cytokinine cytokinins darkness economic plants envejecimiento feuille fisiologia fonction physiologique grain crops growth inhibitors hojas inhibidores del crecimiento kinetin leaves light luz oats obscuridad organic compounds organic nitrogen compounds physical states physiological functions physiologie physiology plant anatomy plant growth substances plantas plante plante de culture plants produit agrochimique quinetina radiation retardateur de croissance vieillissement